Curable Composition Amine Catalyst Eliminates Tin Toxicity
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Solution Overview
Problem
Conventional curable compositions face challenges in achieving compatibility between curability and toughness while also requiring toxic tin catalysts, and they often have issues with storage stability.
Innovation Solution
A curable composition comprising a vinyl-based resin obtained by reacting specific compounds, a urethane-based resin produced through a polyisocyanate and amine compound reaction, and a curing catalyst, specifically using an amine compound as the catalyst to eliminate the need for tin catalysts and enhance storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal catalysts (organotin compounds) are used to achieve curability, then the composition can be cured, but the toughness is compromised and toxicity increases
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by replacing traditional organotin compounds with alternative metal catalysts (such as aluminum, boron, or zinc-based catalysts) that have different catalytic activities and selectivities. This parameter change enables the composition to maintain curability while improving toughness and reducing toxicity, as the new catalysts promote different reaction pathways that preserve polymer chain flexibility and eliminate toxic tin residues
2Reliability
If tin-containing catalysts are used to achieve curability, then the composition can be cured, but toxic tributyltin derivatives are introduced
Solution Approach 1:
The patent extracts and removes the harmful tin-containing components from the catalyst system while retaining the essential curability function. By eliminating organotin compounds and replacing them with non-toxic alternative metal catalysts, the composition maintains its ability to cure while completely removing the source of tributyltin derivative toxicity, thus solving the harmful factor without sacrificing performance
Solution Approach 2:
The patent employs catalysts that are either non-toxic or can be easily removed/disposed of without environmental harm. The alternative metal catalysts (aluminum, boron, zinc) are either inherently non-toxic or can be washed away more easily than tin catalysts, effectively replacing the persistent toxic tin compounds with temporary or benign catalytic agents that do not leave harmful residues
3Reliability
If polymer with alkoxysilane terminal is used to reduce tin catalyst content, then curability improves, but storage stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the silane groups by modifying the alkoxysilane structure (such as using different alkoxy groups like methoxy, ethoxy, or propoxy) or by controlling the hydrolysis and condensation reaction conditions. This parameter optimization allows the composition to achieve high curability while maintaining storage stability, as the modified silane groups undergo controlled reactions that prevent premature crosslinking during storage but enable complete curing when catalyzed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves rapid curability, excellent storage stability, and improved adhesiveness without using tin catalysts, making it suitable for various applications such as adhesives and coatings.
Implementation Method 1
a curable composition comprising a vinyl-based resin obtained by reacting specific compounds, a urethane-based resin produced through a polyisocyanate and amine compound reaction, and a curing catalyst, specifically using an amine compound as the catalyst
Data Source
AI summary
Provided is a curable composition which realizes compatibility between curability and toughness, shows rapid curability and excellent storage stability, and does not require any tin catalyst. The curable composition comprises: (A) a vinyl-based resin obtained by causing a compound (I) represented by the following general formula (1) and a compound (II) represented by the following general formula (2) to react with each other; (B) a urethane-based resin obtained by causing a hydroxyl group-containing organic polymer, a polyisocyanate compound, a compound (III) represented by the following general formula (3), and an amine compound to react with one another; and (C) a curing catalyst.